To provide an air bleeding valve capable of easily performing air bleeding.

The air bleeding valve is mounted to a drain port 31 of a pressure sensor 11 and is equipped with a valve body 41 for discharging air mixed into oil via the drain port 31. The valve body 41 is formed with a connection passage 81 connected to the drain port 31, a valve chamber 111 provided for a base end of the connection passage 81, and an air bleeding route 161 for discharging the oil which has flowed from the connection passage 81 into the valve chamber 111 to the outside. A ball valve 121 for opening/closing an end part opening part 122 of the connection passage 81 is provided for the valve chamber 111 to be movable, and an operation part 131 for moving/operating the ball valve 121 is screwed to a screw hole 103 of the valve body 41. The air mixed into the oil in the connection passage 81 can be discharged together with the oil from an air bleeding route 161 via the valve chamber 111 by valve-opening operation of the operation part 131.

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